In a training workshop on educational technology at Keshav Vidyapeeth in Jaipur, the use of visual symbols with overhead projector (OHP) as a teaching aid will be organised on December 18 for the participants from different districts of Rajasthan. It was felt by the organizers that many institutions have OHPs but their use is minimal because teachers don't possess the skills to prepare the transparencies and don't have enough practice to use an OHP in an efficient manner.
According to the coordinator of the workshop, Sushila Sharma, an
OHP is a modified slide projector that is used to display images to
students while facing them all the time. In this projector a mirror,
a lens that focuses and redirects the light forward and not above.
Transparencies are placed on top of the illuminated flat plastic
fresnel lens for projection. The main advantage of OHP is it allows
both the presenter and the audience to see the image at the same
The sessions for training in the classroom use of OHP will include
the practice of drawing visual symbols and stick drawing; preparing
transparencies; techniques of using OHP like displayed writing,
complete exposure, successive exposure, overlay and shadow play with
flat objects and cut-outs. Hands-on experiences in making
transparencies and their presentation in micro-teaching setting will
be given to the participants, inform the organizers.
For inculcating a habit and proper handling of an OHP, practice to
stand off to one side of the overhead projector with continual facing
of the audience and not the screen will be provided. Placing the
overhead to right if the presenter is right handed and to the left if
he or she is left handed makes it easier for you to face your
audience and write.
The organizers feel that relevance of OHPs still exists since the
modern technologies making use of LCD projectors and power-point
presentations are more prone to failure and increase dependence on
the marketed software. There exist evidences that computer projection
systems have much steeper learning curve for the user than an OHP and
the latter allows a more direct interaction through live writing on
the transparency as one teaches in the classroom.